After the Fake Heiress Won Me Over, I Chose to Lie Flat

I transmigrated into a story about a rich heiress and the girl raised in her place, as nothing more than an ordinary background character.

The girl my family adopted was the real heroine of the book.

I planned to keep my head down, wait for her to return to her wealthy family and reach the top, then quietly make my exit.

But the plot seemed... off.

She wasn't picking fights with the real heiress or building a career. Instead, she spent all day fussing over me.

Her gaze was so tender it could melt you, and her behavior was far too intimate.

Then one day, she pinned me against the wall and said in a husky voice:

"Big sis, you can't escape."

Me: ???

What happened to the plot? Heroine, why aren't you following the script?

Message: Unwavering resolve